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suitable boiler replacement

airhead
airhead Member Posts: 9
in Gas Heating
I have a small commercial boiler Weil McLain LGB650 (650,000 input) I need to replace but the boiler is 30+ weeks out. I cant find anything available and I don't have enough room to twin smaller cast boilers. This feeds 3 fan coils and some baseboard radiation. My question is would a condensing boiler make sense. I am concerned that running at high temperatures would lose the efficiency and shorten the life of the boiler. I am also concerned about the flow. I currently has 2 circulators with a flow rate of 40 gpm each. I think that would be a problem even if it's piped with primary/secondary.
I really would like the simplicity of the cast boilers.
I will be consulting with my distributers tech department but value your guys opinions.
Thanks in advance.

Comments

  • Hot_water_fan
    Hot_water_fan Member Posts: 2,040
    It's a common misconception that high temperatures at design temperature harm efficiency over the course of a year. If the fan coils/baseboard can return condensing temps for 95% of the year (guessing!) efficiency will be fine! That's assuming the baseboard and fan coils actually need the highest temps on design day. That's usually not the case if the original heat loss was botched, which it typically was.
    airhead
  • KC_Jones
    KC_Jones Member Posts: 5,840
    Hot_water_fan said:

    It's a common misconception that high temperatures at design temperature harm efficiency over the course of a year. If the fan coils/baseboard can return condensing temps for 95% of the year (guessing!) efficiency will be fine! That's assuming the baseboard and fan coils actually need the highest temps on design day. That's usually not the case if the original heat loss was botched, which it typically was.

    That could also mean they don't need a boiler with 650k of capacity, which could help the lead time issue, if true.

    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
    Hot_water_fanMad Dog_2kcopp
  • airhead
    airhead Member Posts: 9
    I understand that. In this case it is a school. They like to do setback when the school is out. Then recover before it reopens. Would it make sense to just allow more time to recover to maintain the lower water temp? Maybe I just answered my own question. :|
    Thanks
  • Hot_water_fan
    Hot_water_fan Member Posts: 2,040
    @airhead that or use a wider delta T. A delta T of 13 is tight!

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